My test drive of the front suspension revealed a lot of "metallic noise" transmitting into the cabin. What may well have been the culprit, was I tightened the KONI top nut only holding back by the 11mm hex which is at the top of the strut (centered within it, the damping adjustment tab). You can't get a lot of counter-torque with such a small resistance, so I think the strut shaft might have been turning inside the spherical top mount bearing. I think the KONI Sport manual calls for a torque of around 55 lb.ft. on the main nut, and I'm sure I wasn't at that. This time around, I'll use my impact on the top nut (24mm? from memory) and confirm torque achieved with my torque wrench. I'm installing the Eibach isolators regardless.... as I said, it cannot hurt NVH, and it is better than metal to metal.
Onward.